Mimicking cardiac fibrosis in a dish: fibroblast density rather than collagen density weakens cardiomyocyte function

A.C.C. van Spreeuwel, N.A.M. Bax (Corresponding author), B.J. van Nierop, A. Aartsma-Rus, M.J.T.H. Goumans, C.V.C. Bouten

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Cardiac fibrosis is one of the most devastating effects of cardiac disease. Current in vitro models of cardiac fibrosis do not sufficiently mimic the complex in vivo environment of the cardiomyocyte. We determined the local composition and mechanical properties of the myocardium in established mouse models of genetic and acquired fibrosis and tested the effect of myocardial composition on cardiomyocyte contractility in vitro by systematically manipulating the number of fibroblasts and collagen concentration in a platform of engineered cardiac microtissues. The in vitro results showed that while increasing collagen content had little effect on microtissue contraction, increasing fibroblast density caused a significant reduction in contraction force. In addition, the beating frequency dropped significantly in tissues consisting of 50% cardiac fibroblasts or higher. Despite apparent dissimilarities between native and in vitro fibrosis, the latter allows for the independent analysis of local determinants of fibrosis, which is not possible in vivo.

Original languageEnglish
Pages (from-to)116-127
Number of pages12
JournalJournal of Cardiovascular Translational Research
Volume10
Issue number2
DOIs
Publication statusPublished - 1 Apr 2017

Keywords

  • Cardiac fibroblast proliferation
  • Cardiac fibrosis
  • Cardiomyocyte functionality
  • ECM accumulation
  • Engineered cardiac tissue

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